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[Ada] Correctly set Last when calling Text_IO.Get_Line on empty string

From: Arnaud Charlet <charlet at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Yannick Moy <moy at adacore dot com>
Date: Mon, 2 May 2016 05:50:52 -0400
Subject: [Ada] Correctly set Last when calling Text_IO.Get_Line on empty string
Authentication-results: sourceware.org; auth=none

Ada RM requires that procedure Text_IO_Get_Line sets Last to
Item'First - 1 when parameter Item is the empty string, which was not
performed until now.

Tested on x86_64-pc-linux-gnu, committed on trunk

2016-05-02  Yannick Moy  <moy@adacore.com>

	* a-tigeli.adb (Get_Line): Always set Last prior to returning.

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